某V型发动机凸轮轴扭振突变原因分析与改进
Analysis And Improvement of Abrupt Torsional Vibration of Camshaft of A V6 Engine
余锦海 1董家玮 2曾德林 1廖升友 1张发雄 1魏晓东 1钟秀俊1
作者信息
- 1. 广西玉柴机器股份有限公司,广西 玉林 537000
- 2. 广西大学 机械工程学院,广西 南宁 530004
- 折叠
摘要
针对某V型发动机在油泵速比 4:3 情况下运行过程中传动链条断裂的问题,开展发动机转速波动与扭振测试,发现右侧凸轮轴在发动机全负荷加速进程中存在转速突增和 4 阶扭振突变现象,怀疑传动链条断裂与右侧凸轮轴扭振突增有关.为解决右侧凸轮轴扭振突增的问题,更改油泵速比为 10:9,再次开展测试进行对比分析,结果表明:油泵驱动齿轮与右侧排气凸轮轴转速波动与扭振具有一定相似性,油泵速比改变后,转速波动与扭振均未发生突变现象,右侧排气凸轮轴转速波动率由 52.6%降至 20.7%,凸轮轴扭振在 3.3 阶处达到最大值,最大扭振角由 1.57 度降至 0.506 度,转速波动与扭振得到明显改善,提供了一种右侧凸轮轴转速波动与扭振突增问题的解决方案.
Abstract
Aiming at the problem of transmission chain fracture in a V6 engine running at the pump speed ra-tio of 4:3,the engine speed fluctuation and torsional vibration test are carried out.It is found that the right cam-shaft has a speed surge and a 4th order torsional vibration mutation in the process of full load acceleration of the engine.In order to solve the problem of torsional vibration surge of the right camshaft,the oil pump speed ratio was changed to 10:9,and the engine speed fluctuation and torsional vibration were tested again for comparative analysis.The results showed that:The rotational speed fluctuation and torsional vibration of the oil pump drive gear and the right exhaust camshaft are similar to some extent.After the change of the oil pump speed ratio,the rotational speed fluctuation and torsional vibration of the right camshaft of the engine have no sudden change,and the rotational speed fluctuation decreases from 52.6%to 20.7%,and the torsional vibration of the camshaft reaches the maximum value at the 3.3 level.The maximum torsional vibration Angle is reduced from 1.57 de-grees to 0.506 degrees,and the rotational speed fluctuation and torsional vibration are obviously improved,which provides a solution to the problem of rotational speed fluctuation and torsional vibration surge of the right camshaft.
关键词
凸轮轴/扭振突变/转速波动/油泵速比Key words
Camshaft/Torsional vibration mutation/Speed fluctuation/Oil pump speed ratio引用本文复制引用
基金项目
广西重点研发计划(桂科AB22080084)
广西科技重大专项(桂科AA22068102)
出版年
2024
NETL
NSTL
万方数据